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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2017-09-14 16:50:14 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-09 12:17:59 +0200 |
| commit | b209a097ca39ea586588d77ce680826103020af7 (patch) | |
| tree | ea676ac443b6a929acc1cab26a57021b2b98f465 /crypto/ahash.c | |
| parent | 9bf8d5bf50510a6898943dbb397b7cb529301614 (diff) | |
ACPI / PCI: Bail early in acpi_pci_add_bus() if there is no ACPI handle
commit a0040c0145945d3bd203df8fa97f6dfa819f3f7d upstream.
Hyper-V instances support PCI pass-through which is implemented through PV
pci-hyperv driver. When a device is passed through, a new root PCI bus is
created in the guest. The bus sits on top of VMBus and has no associated
information in ACPI. acpi_pci_add_bus() in this case proceeds all the way
to acpi_evaluate_dsm(), which reports
ACPI: \: failed to evaluate _DSM (0x1001)
While acpi_pci_slot_enumerate() and acpiphp_enumerate_slots() are protected
against ACPI_HANDLE() being NULL and do nothing, acpi_evaluate_dsm() is not
and gives us the error. It seems the correct fix is to not do anything in
acpi_pci_add_bus() in such cases.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto/ahash.c')
0 files changed, 0 insertions, 0 deletions